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1.
Proper: Broken in french

Slang: French kids use it a lot to say that you've been dissed big time, while doing arm gestures.

Became very big after the movie 'Brice de Nice' came out.
"Watcha doin?"
"Yo momma"
"Cassé!"
by GetWacky November 09, 2006
 
2.
basically means owned but in french
omg u were like soo owned u were totally CASSéé
by sophiee December 10, 2005
 
3.
Noun: An Urban and extremely ghetto section of Mahopac. A place were massive amount of drugs are sold.
Adjective: A word meaning top of the line, or second to none.
Casse Hoodrat 1"Yo G-Supp just copped a new 2 door Benz"
Casse Hoodrat 2"Yea i saw that shit, it looks so Casse"
by $amson March 22, 2007